Memory matrix frames



23, 1965 r F. J. WOOD 3,218,694

MEMORY MATRIX FRAMES Original Filed Feb. 20, 1958 (C J (0 (Q 8ll/j/l/ll/I/ 8 FIG. 2.

INVENTOR.

fmm ar/av W United States Patent 3,218,694 MEMGRY MATRIX FRAMES Frank.l'oseph Wood, Chandlers Ford, England, assignor to The Plessey (IompanyLimited, Ilford, England, a British company ()riginal application Feb.20, 1953, Ser. No. 716,496, new Patent No. 3,126,526, dated Mar. 24,1964. Divided and this application Nov. 6, 1963, Ser. No. 321,740 2Claims. (Cl. 29-1555) This application is a division of US. applicationSerial No. 716,496 filed February 20, 1958, now US. Patent No. 3,126,526granted March 24, 1964.

This invention relates to memory matrix frames of the type in which anumber of individual magnetisable annular cores are threaded on thewires of a network or mat of wires extending in different directions insuch manner that while each wire of each of a number of sets havingdifferent directions passes through a number of individual cores, onlyone core is passed through by both of two wires each belonging to adilferent set. It is common practice to mount the mats formed of two, orin some cases more, sets of wires associated with and passing through aseries of cores, in a frame, in which the wires are secured in a tautposition. This has hitherto been effected by securing in or on theframe, along the sides thereof, an appropriate number of terminal tags,posts, or the like, to which the ends of the individual wires wererespectively secured by soldering or the like, and which served asterminals for the external connections to the matrix wires, theseexternal connections being again normally effected by soldering. Thepresent invention has for an object to provide an improved arrangementcapable of simple manufacture and permitting close spacing ofterminations.

According to the invention the matrix frame is built up of two framelaminae secured to each other face to face, with the matrix wiresextending through the joint between the two laminae so as to be securedto the frame by the cement or the like joining the two laminae. Eachframe lamina may further be composed of one, two or four component partssuch as limbs or half-frames as convenient. Preferably the mat is builtup on one of the frame laminae in a jig including means for keeping theframe wires taut across the said frame laminae and in contact with thelatter, and the second frame lamina is then placed on top of the firstframe lamina and the wires extending across the latter, after theapplication of a cement or other binding means, whereafter the two frameelements are pressed against each other, heat being applied at the sametime where necessary or desirable according to the kind of cement or thelike employed, and after the cement or other binding means has set orhardened to the desired extent, the frame with the mat is removed fromthe jig after the wires have been cut or detached from the jig. Thecutting is effected in such manner that wire ends suitable to formconnector terminals project from the outer side of the frame. Theseprojecting wire ends are preferably tinned by conventional methods tofacilitate soldering other wires, for example of other matrices.

The invention will now be described in more detail by way of examplewith reference to the accompanying drawing.

FIG. 1 is a schematic perspective View of a mat of memory cores with twosets of wires extending at right angles to each other, part of the upperlamina being broken away for greater clearance.

FIG. 2 similarly illustrates a simple form of jig suitable for carryingout the invention, and

FIG. 3 is a sectional elevation of the jig in use.

3,218,694 Patented Nov. 23, 1965 ice Referring now to the drawings, theannular cores, which may consist of so-called square-loop ferrites, arereferredto by reference numeral 1, and the two sets of wires by 2 and 3respectively, while the matrix frame consists of two laminae 7 and 9,preferably made from fabric-based or paper-based or fibre-glass basedplastic sheet. The wires 2 and 3 are secured in a taut condition in ajig comprising a plywood frame 4 having a central aperture 5corresponding to the size of a matrix proper, this aperture beingsurrounded by a recessed shoulder 6 adapted to accommodate one lamina 7of the matrix frame according to the invention in such manner as to beflush with the surface of the plywood frame 4. Pins 8 extend along theother sides of the jig 4 for securing the wires 2 and 3 after the samehave been duly tightened. After or before the wires have been tightenedand secured as described, a strong cement, for example, the cement knownunder the registered trademark Araldite, which is of the thermosettingkind, is applied and the second lamina 9 is placed on top of the lamina7, with the wires interposed between the two frame laminae 7 and 9.These laminae are then bonded together by curing under pressure at therequisite temperature, whereafter the bonded plastic frame with the wiremat can be removed from the jig, for example by cutting the wires justabove the pins 8. This leaves straight connector ends 10 of each wireprojecting outwardly from the outer edge of the frame. These projectingends may, if required, be tinned adjacent their outer ends by arapid-dip soldering technique.

It will be readily appreciated that the invention is not limited to allthe details of the example described. Thus it is not necessary for eachframe lamina 7 and 9 to be one integral piece, but one or each may bebuilt up of a number, preferably 2 or 4, of abutting pieces providedthat the butt joints of the two laminae are offset relative to eachother. Furthermore the jig may be varied in a number of ways which willbe obvious to those skilled in the art, for example by providingindividual tightening means for each wire, or in some cases by providingspring tensioning devices or clamping plates. The tightening means may,if desired, be of the kind commonly used for the strings of musicalinstruments such for example as pianos or violins.

I claim:

1. A method of constructing a magnetic memory matrix, having a wire matand magnetic cores threaded on the wires thereof, comprising providing aconstruction jig having means for supporting and locating a frame laminawith one of its main surfaces exposed and means for locating the wiresof a mat thereon and for attaching the ends of the Wires thereto withintermediate portions of each wire in contact with such lamina, placingand locating a frame lamina on said jig, building up the wire mat bythreading each wire through the appropriate cores, locating andtightening such individual wires on the jig while attaching the ends ofeach wire to the jig, placing a second frame lamina over thefirst-mentioned lamina and said wires with the interposition of a layerof adhesive material between said laminae, applying pressure to presssaid laminae together, while causing the adhesive to set, severing thenetwork wires at points spaced outwardly from the frame lamina, andremoving the complete matrix from the jig.

2. A method of constructing a magnetic memory matrix of the typecomprising a quadrilateral frame with at least two sets of substantiallyparallel, flexible, electric conductor wires extending in substantiallydifferent directions between each set extending between two sides ofsaid quadrilateral frame and a plurality of individual toroidal cores ofmagnetizable material held by said sets 3 of Wires, one core at each ofthe intersections of the affixing a second of said laminae to the firstby means wires of said sets, the steps comprising, of said cement withthe wires crossing the laminae providing two quadrilateral framelaminae, embedded theffibetwfiell, and providingajig witha quadrilateralopening and a recess releasing Said Wire ends from Said j and removingsurrounding said opening adapted to receive one of 5 the Wired framethemfromsaid quadrilateral laminae,

fitting a first of said quadrilateral laminae in said References Citedby the Examiner recess UNITED STATES PATENTS stringing wires of saidsets across said opening in said 2,182,968 12/1939 Lunsford 29-155.5 jigwhile inserting the cores thereon, 10 2,927,878 3/1960 Beckman 29155.62tightly fastening the two ends of each of said wires 2,961,74 11/1960Smith 29155.5

of the sets to the jig in region outside of said recess, applying alayer of cement to the surfaces of said recess WHITMORE WILTZ Pr'maryExammercrossed by said wires, JOHN F. CAMPBELL, Examiner.

1. A METHOD OF CONSTRUCTING A MAGNETIC MEMORY MATRIX, HAVING A WIRE MATAND MAGNETIC CORES THREADED ON THE WIRES THEREOF, COMPRISING PROVIDING ACONSTRUCTION JIG HAVING MEANS FOR SUPPORTING AND LOCSTING A FRAME LAMINAWITH ONE OF ITS MAIN SURFACES EXPOSED AND MEANS FOR LOCATING THE WIRESOF A MAT THEREON AND FOR ATTACHING THE ENDS OF THE WIRES THERETOO WITHINTERMEDIATE PORTIONS OF EACH WIRE IN CONTACT WITH SUCH LAMINA, PLACINGAND LOCATING A FRAME LAMINA ON SAID JIG, BUILDING UP THE WIRE MAT BYTHREADING EACH WIRE THROUGH THE APPROPRIATE CORES, LOCATING ANDTIGHTENING SUCH INDIVIDUAL WIRES ON THE JIG WHILE ATTACHING THE ENDS OFEACH WIRE TO THE JIG, PLACING A SECOND FRAME LAMINA OVER THEFIRST-MENTIONED LAMINA AND SAID WIRES WITH THE INTERPOSITION OF A LAYEROF ADHESIVE MATERIAL BETWEEN SAID LAMINAE, APPLYING PRESSURE TO PRESSSAID LAMINAE TOGETHER, WHILE CAUSING THE ADHESIVE TO SET, SEVERING THENETWORK WIRES AT POINTS SPACED OUTWARDLY FROM THE FRAME LAMINA, ANDREMOVING THE COMPLETE MATRIS FROM THE JIG.